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SergioV

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Posts posted by SergioV


  1. On 3/6/2020 at 10:30 PM, Simon Križnik said:

    Yes, according to Learn Thermal Analysis with Altair OptiStruct ebook:

     

     

    Attached is an example from the ebook which I modified to include multiple heat sources (ambient & local).

    Note: The ambient temperature is applied with convection on the outer surface. The local temperature is imposed at one end of the tube. This approach is valid for 3D elements, but not for 1D beams.

    Pipe_One_Step_Transient_multiple.fem 2.63 MB · 1 download

    And is there any way of doing it with 1D beams?


  2. On 1/30/2018 at 6:54 AM, Sanjay Nainani said:

    Hello,

     

    After creating all the loads you can combine all of them into a single "Load collector" whose card image should be "LOADADD". 

    image.png.e3abc406c98f199bddc667bd9fc8857c.png  

     

    image.png.6b353f96ce83fa3f2987d74a59be4ee6.png

     

    S1 is the scale factor.

     

    Select all the loads in this load collector.

     

    Then i think you can do a linear static analysis. In that reference the constraint and in place of "Load" reference the "LOADADD" load collector.

     

    You can reference the following type of loads in the "LOADADD" card. 

     

    image.thumb.png.65665742af418a8449d88a97d45c6c7c.png

     

     

    You can also refer the help section for more information.

     

    Thankyou

    And if you have TLOADs?


  3. 12 hours ago, Simon Križnik said:

    Hi,

     

    this is a simple analysis:

     

    For more advanced thermal simulations please refer to FREE eBook: Learn Thermal Analysis with Altair OptiStruct

    thermal_beam.femUnavailable

     

    Okk thanks!!

     

    One more question. It's a different situation. Now I have a One-Step Transient Thermal Stress Analysis (I already checked the info around this). So I did a model with the environment as heat source (the temperature of the surroundings go from 17 to 23 degrees), so I used a TLOAD, TABLED, SPC TEMP, SPCD, TSTEP and TEMP cards to do both a heat tansfer transient and a linear static analysis with the output temperatures. Now, I'd like to create more heat sources (for example due to the heating of a engine). Do I have to create the same cards now for this new source (having in mind that I want to mantain the source of the environment) and then include both TLOADS in a DLOAD? (and therefore introduce this DLOAD in the LoadStep).

     

    Hope I explained well,

     

    Thanks a lot in advance

     


  4. Good afternoon,

     

    I have a BEAM (CBEAM) component and I would like to see how it deforms due to a VARIABLE TEMPERATURE applied to the whole BEAM. Is that possible? Obviously I would only like to see how it deforms on the direction of it's axis (as a BEAM is a 1-D element). The TEMPERATURE would go from 17 to 23 degrees in 6 hours (1 degree increment every hour)

     

    Thanks a lot in advance!

     

    Sergio


  5. Thanks! Now I changed the load step to a transient analysis because I am gonna set up an ambient temperature and with convection and conduction see how the temperature increases in the solid and also how it deforms.

     

    Nevertheless in a tutorial about "Transient Thermal Stress Analysis" it says that I have to create a CONVECTION interface and refer it to the Material I just created.

    image.png.ce478475af6999cc4482786dccb2b7f6.png

     

    That material is also created in the tutorial and it is a MAT1 with data for MAT 4

     

    image.png.5bcaeaa1c48cf23baacb7a01f7db937d.png

     

    But when in the convection card image I try to select that material it doesn't appear

     

    How could I fix it?

     

    Thanks!


  6. Hi!

    I would like to make a transient analysis with temperature. I mean:

    •  Going for example from 17 to 23 degrees of the temperature of a body in 1 hour. Making steps of 10 minutes for example (total of 6 steps).

    I tried to do it with TABLED, TSTEP and creating a temperature LOAD but it doesn't work. It says :

     

    " *** ERROR # 2094 ***
     EXCITEID on TLOAD1 # 17 data references follower force or nonexistent 
     DAREA/static loading with ID # 16."

     

    Could you help me?

     

    Big thanks in advance


  7. Hi!

    I get this error when trying to run Optistruct

     

    "ERROR: Starting Run Manager in read-only folder. Please change "Start in" location in Properties of solvr icon/menu and/or move input file to a different location"

     

    I've moved it to many different places and still get this error, plus I don't see where to change the "Start in" location.

     

    Thanks in advance!

     


  8. I made a normal modes analysis and now with Hyperview i'm trying to get the data I need. I already got the eigenvectors (X,Y,Z) for each of the modes using the Matrix Browser. Nevertheless when I get those result I don't get the natural frequency (eigenfrequency) related to that specific eigenvectors. As you see in the picture below, the frequency doesn't appear (only that those data is related to "sel1"). How could I make the eigenfrequency to appear there so ones I postprocess the results I can get access to that data?

     

    Thanks in advance

     

    Sergio

     

    image.thumb.png.95f2fb42ee632aaaf90281f1b443cb9d.png


  9. Good morning!

     

    I'm trying to model the 4 cables shown in the attached file. At first I thought of using Beams to make it easier but the fact is that those cables cannot transmit moment (rotation) in the joints (2 joints in each cable). How should I do it? Do I change the element type? Is there any way of erasing restriction of the rotational DOF at the joints?

     

    Hoping a quick response and thanks in advance!

     

     

    Conjunto tubos.STEP


  10. Hi!

     

    I'm trying to mesh a solid with TetraMesh and it states the following error: "2 edges failed nodal setup. Meshing failed".

     

    But I can't see anything wrong or red colored or anything that tells me where the mistake is. Even with visualisation options. The solid is created properly with bounding surfaces so I guess there are not free edges.

     

    Could you help me?


  11. Good morning,

     

    I'm running a transient analysis of 2 gears (one of them with a preload and the other one with an imposed rotation). When I run it with Optistruct I get 2 problems:

    •  *** ERROR # 4965 ***
       Maximum number of time increment cutbacks reached,
       analysis aborted.
    • The biggest problem comes here, if I analysis the results, the contact status is 0 everytime. The gears rotate but they don't seem to have a good contact. Moreover, I get high normal contact forces at points where there should be any contact (see image attached).

     

    I also attach the .fem to make it quicker and the .out from the previous simulation

     

    Thanks!!

    A.PNG

    1107rem.out 1207manana.fem


  12. Good morning,

     

    I'm running a transient analysis of 2 gears (one of them with a preload and the other one with an imposed rotation). When I run it with Optistruct I get 2 problems:

    •  *** ERROR # 4965 ***
       Maximum number of time increment cutbacks reached,
       analysis aborted.
    • The biggest problem comes here, if I analysis the results, the contact status is 0 everytime. The gears rotate but they don't seem to have a good contact. Moreover, I get high normal contact forces at points where there should be any contact (see image attached).

     

    I also attach the .fem to make it quicker and the .out from the previous simulation

     

    Thanks!!

     

    A.PNG

    1107rem.out 1207manana.fem


  13. Hi! I wanna model the rotation of a gear (wheel) with a preload in the pinion. I asume the preload is modeled with a moment but, how do I model the rotation? And which analysis type should I choose? (I don't want  a quasi-static one). Some analysis don't let me include a LOAD. Thanks in advance!


  14. Hi! I wanna model the rotation of a gear (wheel) with a preload in the pinion. I asume the preload is modeled with a moment but, how do I model the rotation? And which analysis type should I choose? (I don't want  a quasi-static one). Some analysis don't let me include a LOAD. Thanks in advance!

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